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矿床赋存于L花岗岩体外接触带(0—120m)的碳酸盐岩中,矿化围岩为中泥盆统应堂组泥质灰岩。矿体呈透镜状或似层状,属细脉浸染型矿化。矿化可分为四个阶段。工业矿物为沥青铀矿,呈显微浸染状、显微脉状分布于方解石中,或充填、交代伴生矿物。脉石和金属矿物主要有方解石、黄铁矿、方铅矿、闪锌矿、黄铜矿和砷黝铜矿等。矿脉两侧的围岩呈现面型和线型弱热蚀变。L花岗岩体出露面积238km~2,为一个单阶段侵入岩基,其岩性主要是粗-中粒黑云母花岗岩。鉴于铀矿化年龄(65.0一30.7 Ma)较L花岗岩体成岩年龄(318一202 Ma)小得多,因此可认为矿化与花岗岩浆活动无成因上的联系。但花岗岩在下列方面对3701铀矿床的形成起重要作用:提供铀源和错:为矿化提供少量硫、碳和微量元素;形成有利于含铀溶液集聚的隔水底板;为加热含矿溶液和促使其对流循环提供部分热源.
The ore deposits occur in the carbonate rocks of the outer contact zone (0-120m) of L granite, and the mineralized wall rocks are mudstone limestone of the Middle Devonian Yingtang Formation. Ore body was lenticular or lamellar, is veinlet type mineralization. Mineralization can be divided into four stages. Industrial minerals are bitumen uranium ore, was disseminated micro-like, microscopic veins distributed in calcite, or filling, account of accompanying minerals. Gangue and metal minerals are mainly calcite, pyrite, galena, sphalerite, chalcopyrite and arsenic tetrahedrite. Surrounding rocks on both sides of the veins present a faceted and linear weak thermal alteration. L granite body exposed area of 238km ~ 2, is a single stage intrusion rock base, the lithology is mainly coarse - medium-grained biotite granite. Since the age of uranium mineralization (65.0-30.7 Ma) is much smaller than the diagenetic age of L granite (318-202 Ma), there is no genetic relationship between mineralization and granite magmatism. However, granites play an important role in the formation of 3701 uranium deposits in the following areas: uranium sources and faults are provided: a small amount of sulfur, carbon and trace elements are provided for mineralization; a water-impermeable backplane is formed to facilitate the accumulation of uranium-bearing solutions; And to promote its convection cycle to provide some heat.